Metallic bottom plate for pigeon holes



2 Sheets-Sheet 1.

(No Model.)

I. L. DUNN.-

METALLIC BOTTOM PLATE FOR PIGEON HOLES.

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 0 A0 0 Av w fl O G O O Q O Q Q G Q Q a 0 DOGS @OOO

COO

COD

2 Sheets-Sheet 2 v I. L; DUNN. METALLIC BOTTOM PLATE FOB PIGEON HOLES.

Patented July 30, 1889.

I G E'I 0000 0000 i; 01 1 i g H 0. E E W 01 2 EM 0 m E/ 5i g E 900060 G 0 O G I m: h g E 0 0 0 0 v .2 m .0 E E '0 Q Q O O O i E E 0 0 0 0 M w 0 0 0 0 f "a m m 0 @00 FF. 00 W OOOOGOO QOOGGOG r E E F 0000 i Z @QQ. m 00 00 0000 Z E (No Model.)

Baacllfiamz; 13 194a alikvcmqa UNITED STATES PATENT OFFICE.

ISAAC L. DUNN, OF STAMFORD, CONNECTICUT, ASSIGNOR TO THE YALE 85 TOWNE MANUFACTURING COMPANY, OF SAME PLACE.

METALLIC BOTTOM PLATE. FOR PlGEON-HOLES.

SPECIFICATION forming part of Letters Patent No. 408,001, dated July 30, 1889.

Application filed March 20, 1889.

To aZZ whom it may concern..-

Be it known that I, ISAAC L. DUNN, of Stamford, county of Fairfield, and State of Connecticut, have invented "certain new and useful Improvements in Metallic Bottom Plates. for Pigeon-Holes, of which the following is a specification, reference being had to the accompanying drawings. a

The object of my invention is to provide a light, cheap, durable open bottom for pigeonholes or posieofliee boxes'asan independent article of manufacture, so constructed as to be readilg applied generally to such uses. I

form my improved perforated or open-work bottom of sheet metal, so that I can stamp out at one operation the entire plate with its perforations, its projections for forming stiffeners, and its notches for adaptingit to be readily secured to place.

In the accompanying drawings, Figure 1 is a plan view of a blank for a bottom plate with projections at its sides for forming stiffeningribs, and notches in such ribs to receive a rod or pin to hold the plate in place. Fig. 2 is a plan View of suclnplate after the edges or ribs have been turned down to form marginal stiffeners. Fig. 3 is a section on the line 3 3 of Fig. 2. Fig. 4 shows a perforated sheet-metal blank slitted and notched, from which the form of bottom plate shown in Fig. 5 is made, Fig. 5 being a top view of the finished bottom plate. Fig. 6 is a section on the line 6' 6 of Fig. 5. Fig. 7 is an edge view of the plate shown in Fig. 5. Fig. 8 shows a different form of blank. Fig. 9 shows a plate that is stiifened by being corrugated, and Fig. 10 is a cross-section of the same.

Referring to the letters upon the drawings, A indicates a bottom plate of sheet metal, and B its perforations, which may be of any desired form or number. In Fig. 1, which shows a blank, the corners are cut away at C, so that the side and end projections D maybe turned down at right angles with the plate where the dotted lines appear, to form marginal stren gth- Serial No. 303,950. (No model.)

ening-ribs. E indicates notches in these ribs, adapted to receive a cross pin or rod, which in practice is usually placed in them under the bottom plate and passes through the veriical side partitions of pigeon-holes, to hold the plate in place in the bottom of the hole. As this holding rod or pin forms no part of my present invention, it is not illustrated.

Figs. 5 to 10, inclusive, show formal modifications of my improvement, in which the marginal ribs or stiffeners are dispensed with, and a lip F is formed by cutting slits G (see Fig. 7) in the blank, and then turning them down at right angles to the plate. In these lips are formed notches E for a holding rod or pin.

The lips shown in Fig. 6 might be formed of projections from the sides of the blank, as shown in Fig.8, these projections being turned down at right angles in the manner indicated in Fig. 6. I thus produce a perforated sheetmetal bottom for pigeon-holes which can be rapidly and cheaply made by a single operation of stamping, and then afterward folding down more or less at the margin, as described. A single lip or downward projection will do; but I generally use two. Figs. 9 and 10 show corrugations for stiffeners.

If desired, the form of my sheet-metal perforated plate might be still further changed as, for example, ribs might be formed only part way around the margin-without departing from the substance of my invention.

\Vhat I claim is As a new article of manufacture, a perforated sheet-metal bot-tom for pi goon-holes, provided with a downward projection on its side notched to receive a rod or pin for holding said bottom in place, substantially as set forth.

In testimony of all which I have hereunto subscribed my name.

ISAAC L. DUNN.

\Vitnesses:

SCHUYLER MERRITT, GEo. E. WHITE. 

